This is a cheap way to cleanly add a tach to your non-tach Ranger. Green illumination. Tested in my personal truck and everything works. The illumination color has not been tampered with at all.

Here is a how-to on swapping in your odometer so your mileage will be correct. Very easy to do with some patience for working on small parts.

98-03s are plug and play with this cluster.

Older trucks require more work, but are still fairly plug and play:
95-96s need 3 connector pins swapped around for the dummy lights to all work correctly. Early trucks had their dummy light in different places on the cluster.
95-97s will require swapping out the temperature gauge internals from your old cluster. Very simple to do while you are swapping odometers.
It has been a long time, so I dont remember all the specifics of the above mods required.